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American Mineralogist; July 2004; v. 89; no. 7; p. 1056-1060
© 2004 Mineralogical Society of America
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A near-infrared spectroscopic study of hydroxyl in natural chondrodite

P.S.R Prasad* and L.P. Sarma

1 National Geophysical Research Institute, Hyderabad 500 007, India

Correspondence: * E-mail: psrprasad{at}ngri.res.in

A chondrodite from a marble from Ambasamudram near the Archankovil shear zone, Kerala Khondalite Belt, India, was characterized by powder X-ray diffraction (XRD), electron microprobe and Fourier Transform Infrared (FTIR) spectroscopic techniques. FTIR measurements were carried out in the range 400–10000 cm–1, to record both fundamental and overtone modes. A set of absorption peaks at 3393, 3411, 3561, 3571, 3650, and 3685 cm–1 were observed in the fundamental OH-stretching mode region. In the combination-mode region modes observed at 4103, 4328, and 4440 cm–1 indicate that the majority of M sites in this chondrodite are occupied by Mg. The modes at 3650 and 4520 cm–1 could be due to silanol (Si-OH) groups. A definite band was also observed at 5072 cm–1, whose origin presently is not clear. A weak overtone mode of the strongest OH stretching was observed at 6967 cm–1.




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